下列生物中，不可能用种子培育的是（） A．花生 B．玉米

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问题选择题

下列生物中，不可能用种子培育的是（　　）

A．花生

B．玉米

C．银杏

D．卷柏

答案

花生、玉米都属于被子植物，银杏属于裸子植物，它们都结种子，用种子繁殖后代．卷柏是蕨类植物，不结种子，用孢子繁殖后代．可见D符合题意．

故选：D

单项选择题

1岁半小儿，发热、恶心、呕吐、排黏液脓血便3天，下列哪项可能性最小

A．产毒性大肠杆菌肠炎

B．侵袭性大肠杆菌肠炎

C．细菌性痢疾

D．空肠弯曲苗肠炎

E．鼠伤寒沙门菌小肠结肠炎

填空题

用所给词的适当形式填空。

1. He is __________ (please) with his brother's performance in the school sports meeting.

2. Water __________ (pollute) is really serious because the poison is bad for the river.

3. She __________ (have) her supper with her parents when I got to her home.

4. When he knew the dog died, he left __________ (happy) without a word.

5. We can use knives __________ (cut) meat when we are doing some cooking.

6. He didn't believe their words, so he decided to have a look _________ (he).

7. Please take buses, cars and __________ (taxi) to travel from one place to another.

8. Whom __________ they __________ (study) with this time yesterday?

9. Grandma _________ (have) a bad cold since last Saturday.

10. If we don't protect the wetlands, it will be __________ (possible) to see these birds in the future.