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问题 多项选择题

下列选项中，对垒球比赛规则叙述正确的是（）

A.垒球比赛双方各有10名队员参赛

B.垒球比赛共进行5局，每一局双方各进攻和防守一次

C.第一局以后，每局双方的第一个击球员应为上一局最后完成击球任务的下一个击球员

D.进攻时，队员要逐一上场击球，投手也必须参加防守和进攻

答案

参考答案：B, D

阅读理解

任务型阅读。

Dear Mike,

      We got your letter yesterday. Yes, we can visit you at Christmas. We wanted to spend Christmas at home,

but now we are going to be with you. Jack will not be in school then.

      It is cold now in New York, but it doesn't matter. Sometimes we like the snow.

      We got our plane tickets. We will get to your city on the 18th. We will stay with you for two weeks. Is that

all right with you?

      We'll take our favourite diets, so we can have a nice Christmas dinner.

      See you soon.

                                                                                                                                                 Love,

                                                                                                                                     Mum and Dad

根据短文内容用适当的单词完成下面句子，每空一词。

1. This letter is from Mike's _____________.

2. In New York, it is ____________ now.

3. Mike has a brother called ____________. He is in school now.

4. Mike's parents will go to his city by ______________.

5. His parents will come back on ______________ 31st.

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单项选择题

放射免疫诊断试剂盒不能久置的主要原因（）

A.抗原变化

B.抗体失活

C.放射化学纯度降低

D.细菌污染

E.超过半衰期
查看答案