课时训练（十二） Unit4（八下）
（限时:30分钟）
Ⅰ.单项选择
1.—Have you decided ?
—Yes, tomorrow morning.
A.when will you leave B.How will you leave
C.when to leave D.how to leave
2.[2018·滨州] — I swim here?
—I’m sorry. Children swim alone here. It’s very dangerous.
A.Must; can’t B.May; must
C.Can; mustn’t D.Can’t; can
3.[2018·天津] —Must I come here before 6:30 tomorrow?
—No, you . There will be plenty of time.
A.mustn’t B.can’t C.couldn’t D.needn’t
4.[2018·扬州] —If I want to be an astronaut, how will I get to be one?
—You do well in school and tame your fears.
A.may B.can C.must D.could
5.Here is the book. First, it and then tell me what you think of it.
A.look into B.look through
C.look up D.look after
6.We are going for a picnic. I’ll call Wendy to make sure .
A.why to start B.which to start
C.what to start D.when to start
7.Please hold on to your dream one day it comes true.
A.if B.until C.unless D.though
8.I can’t start this online tour. Can you show me .
A.what to do B.what to do it
C.how to do D.how should I do it.
9.Don’t try to do everything at once. Take it a bit .
A.at times B.at that time
C.at the same time D.at a time
10.—Thanks for listening to my problem and giving me your advice, Amy.
— . That’s what friends are for.
A.My pleasure B.With pleasure
C.Never mind D.It’s nice of you
Ⅱ.[2018·江西]完形填空
There are purple clothes, purple handbags, purple bicycles, purple furniture, even purple computers! So purple is one of the most 11 colors today. But in the past, purple was a very expensive and unusual color. Let’s take a look at the rich 12 of the color purple.
Some scientists believe that the first plants to appear on Earth over 500 million years ago 13 looked purple, not green. Plants today are green because 14 use green chlorophyll（叶绿素） to produce energy. 15 these early plants probably used something called retinal, which is a dark purple color.
During the time of the Roman Empire （37BC—476 AD）, itwas very 16 to make purple dye（染料）. The dye came from sea snails（海螺）. But 10,000 dead sea snails 17 you just one gram（克） of purple dye…as well as a very bad smell! This 18 purple dye was called Tyrian purple, and it was the preferred 19 of emperors.
In 16th-century England, purple was 20 for the king’s family members. Queen Elizabeth I’s clothes were purple, but ordinary people were not allowed to 21 the color.
