【名词&注释】
化学物质(chemicals)、有害化学成分(harmful chemical components)
[单选题]下列认识正确的是
A. 天然物质都是无毒的
B. 金属铁是一定黑色的
C. 化学物质都是有毒的
D. 杜绝生产含有害化学成分的食品
查看答案&解析
点击获取本科目所有试题
举一反三：
[单选题]
A. interested
B. excited
C. satisfied
D. surprised
[单选题]27． Who can you ask for help when your parents quarrel?
A. Grandparents．
B. Uncles．
C. Neighbors or teachers．
D. A．B and C．
[单选题]5．
A. and
B. because
C. but
D. when
[单选题]3．，—How was your school trip?—The students＿＿＿＿＿school trip．
A. have a great
B. had a great
C. having a good
D. has a great
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