【題目】_______you can sleep well, you will lose the ability to concentrate, plan and stay active after one or two nights.

A.OnceB.UnlessC.IfD.When

【答案】B

【解析】

句意：除非你能睡個好覺，否則一兩個晚上后你就會失去集中注意力、計劃和保持活力的能力。

本題考查狀語從句。Once一旦，Unless除非，If如果，When當(dāng)……時候。結(jié)合句意，睡不好覺，你就會失去集中注意力的能力。故選B。

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源： 題型：

【題目】—How’s the weather in your city?

—It _________.

A.rainsB.is rainingC.has rainedD.will rain

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】—Why did you ____ his invitation?

—Because I had a very important meeting to attend that day.

A.turn downB.put awayC.look upD.give out

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】—Can you open a gift ________ after you receive it in England?

—Yes. We don't have to wait.

A.mainlyB.immediatelyC.nearlyD.loudly

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】—I don't know ________ for England?

—Next week.

A.what would they leaveB.what they would leave

C.when will they leaveD.when they will leave

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】—Have you ever been to Singapore?

—Yes, I _______ there with my parents last year.

A.goB.wentC.will goD.have gone

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】Cao Wenxuan’s hometown in Yandu is well worth________.

A.to visitB.visitsC.visitingD.visited

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】—Have you heard from him________ ?

—Yes, I have. I've ________heard from him.

A.yet; alreadyB.already; yetC.yet; just now

查看答案和解析>>

科目：初中英語 來源： 題型：

【題目】—How heavy the boxes are!

—Yes, this one is _____ that one.

A.twice as heavy asB.as twice heavy asC.twice as heavily as

查看答案和解析>>

同步練習(xí)冊答案