there are many different types of food, some animals spend their lives eating only one type.A．SinceB．UnlessC．OnceD．While 题目和参考答案——青夏教育精英家教网—

题目内容

_______ there are many different types of food, some animals spend their lives eating only one type.

A．Since

B．Unless

C．Once

D．While

试题分析： A. Since 自从，既然，B. Unless除非，C. Once 一旦，曾经，D. While 虽然，然而，当…时候，句意：虽然鱼很多种不同的食物，但是一些动物一生只吃一种食物。表示转折关系，所以选D。

练习册系列答案

________ I can see, there is only one possible way to keep away from the danger.

Most of us value our time, but some of us treat it ________ it had no value at all.

______ I always felt I would pass the exam, I never thought I would get an A.
A. While B. Unless C. If D. Until

—I rang you at about nine，but there was no reply．
—Oh，that was probably I was seeing the doctor．

As the interview rule goes，you can take some time to think through answers_______ you make a reply.

—Do you know about the accident which happened in the center of the city?
—Yes. But it was some time we realized the truth.

________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.

A．Since	B．While
C．Unless	D．Though

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