试题与答案

下列四组杂交实验中,能判断显性和隐性关系的是()①红花×白花→红花+白花②非甜玉米×

题型:单项选择题

题目:

下列四组杂交实验中,能判断显性和隐性关系的是()

①红花×白花→红花+白花

②非甜玉米×非甜玉米→301非甜玉米+101甜玉米

③盘状南瓜×球状南瓜→盘状南瓜

④黑毛牛×白毛牛→98黑毛牛+102白毛牛

A.①和②

B.②和③

C.②和④

D.①和④

答案:

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题型:阅读理解

These days, more and more people begin to look after their health by exercising. What sport should we do then?

● Ping-pong

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● Basketball

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Of course, there are some other sports that people can do to keep healthy. But it’s certain that people who often exercise can work better.

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A.playing ping-pong

B.playing basketball

C.doing exercise

D.working小题2:Wang Bing is ______.

A.the worker in the bookstore

B.a ping-pong player

C.a basketball player

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A.added another five tables

B.bought five chairs

C.said ping-pong was good for health

D.was too surprised to do anything小题4:The playground was crowded during the holidays because ______.

A.students still stayed at school

B.people went there to play ping-pong

C.people went there to play basketball

D.students went to school to read books小题5:If people want to do their work better, they should ______.

A.play ping-pong often

B.play basketball often

C.have holidays often

D.do exercise often

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