题目

某男性为白化病基因携带者，在他的下列细胞中，可能不含显性基因的是 ①神经细胞 ②成熟的红细胞 ③初级精母细胞 ④次级精母细胞 ⑤精子 A．①②④ B．②④⑤ C．①③⑤ D．③④⑤ 答案：B用括号内所给单词的适当形式填空。【1】Good books are like wise friends, so try to read more books in ________（you）spare time.【2】How many pictures have you ________（draw）since last month？【3】She was ________（luck）enough to be chosen into the team.【4】Our school art festival will be held on the ________（two）Friday of June this year.【5】I saw many ________（child）playing with their teacher on the playground.【6】When you visit a foreign country, it is important to ask for help ________（polite）.【7】Lucy and her younger brother are cleaning the ________（fall）leaves in the yard.【8】Mr. Wang, our English teacher, suggested ________（read）English aloud every morning.【9】This supermarket is now the third ________（large）in the northwest of China.【10】It is never too late ________（learn）, so just work hard from now on.