问题 选择题

下列哪种情况下,细胞是吸水的?

A.把青菜放在泡菜坛中用盐水浸泡

B.把萎蔫的青菜放在清水中浸泡

C.把萝卜条用食盐和辣椒腌制

D.把蔬菜放在铁锅中炒

答案

答案:B

题目分析:当植物细胞内外液体有浓度差时,植物细胞就会吸水或失水,细胞外部溶液的浓度大于细胞内部浓度时细胞失水,细胞外部溶液的浓度小于细胞内部浓度时细胞吸水,所以ACD三种情况下细胞会失水,只有B吸水,故选B。

阅读理解

需要添加小标题。请从以下选项(A、B、C、D、E、F)中选出符合各段意思的小标题,并在答题纸上将相应选项的标号涂黑。选项中有多余选项。

A.How to deal with listening practice

B.Class atmosphere matters a lot in learning

C.Monitoring activities is one of the main tasks of teachers

D.How to evaluate student performance

E.Group work needs organizing properly

F.Communication skills play a big role in language learning

Both instructors and learners can get benefits from the following learning strategies as long as they are properly made use of in language learning.

小题1:       .

The information presented in this section focuses on specific conversation, discussion, or presentation skills.The activities arc generally self-explanatory, with students expressing opinions, making decisions, solving problems, planning presentations, and so on.Engaged in these activities, students have the possibility of communicating with each other in class.This section also includes lists of expressions used to illustrate different language functions, such as agreeing, disagreeing, and asking for clarity in order to help students expand their knowledge of English.

小题2:       .

in a speaking or listening course, students' anxieties can affect their learning.For this reason, it is important to establish a friendly, relaxed classroom environment.It may help students 10 think of the classroom as a laboratory where they can experiment and take risks with the language.In such circumstances, students should realize that errors are a natural and expected part of learning a language.In addition, one of the goals of this pan is to encourage students to examine their awn opinions and values while at the same time showing respect for the opinions and values of others.

小题3:________.

Many of the activities in this section involve the students' cooperating work in class. Generally, such an activity taken up by four members seem to work the best. Groups of three or five members may also be effective, depending on the activity. The first unit includes guidelines for organizing group work, with students taking on the following roles: leader, reader, summarizer, reporter, and observer(if necessary). Organizing all activities in this way makes the course truly learner-centered since students must take fall responsibility for carrying out each activity. As for seating, group members should arrange their seats or chairs in a small circle to encourage interaction.

小题4:________.

Being a teacher, in the course of group activities, you should circulate from group to group, which helps ensure that students are on task and are using English. While you should not participate in pair or group activities, you need to stay involved in what the students are doing. One important reason to circulate during activities is to keep track of the kinds of problems students have, such as grammatical accuracy, fluency, word choice, pronunciation and intonation discussion strategies, etc. However, it is generally not effective to correct students' errors when they arc involved in an activity The most practical way to deal with communication problems is to make notes of what you observe as you arc circulating. You can then use this information to provide feedback after the activity or to develop future lessons.

小题5:________.

At the beginning of the course, when they need to build up their confidence, students benefit most from encouragement and positive comment. If possible, you'd rather not grade the students fust few efforts at speaking in a group or to the class. Many students suffer such anxiety in speaking situations that any criticism at this stage can have the opposite effects. Commenting on students' work does not necessarily mean grading them on the scene Even if the programs requires formal grades, you should try to put off assigning grades until later in the term.

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