从图生态系统中我们可以看出那些结论（ ） A．狐狸的数量决定兔子的数量 B．兔

单词拼写（共10小题；每小题1分，满分10分）

根据题中所给的首字母写出符合句意的单词的正确形式。

71. This kind of drug can p_________ children from mosquitoes.

72. The noise outside a__________ our study.

73. Tom works so hard, so he will s_________ sooner or later.

74. There are many kinds of i_________ in the world, a bee is one kind of them.

75. Sea water c__________ salt.

76. You will e__________ your health if you work so hard.

77. She prefers pop music and jazz to c__________ music.

78. A m__________ is a person who performs or writes music, especially as his/her job.

79. Police asked some p__________ to get some evidence about the accident happened just now.

80. The group of popular singers will give another two p__________ before leaving China.

以对症治疗为主的传染病是

A．细菌性痢疾

B．艾滋病

C．伤寒

D．病毒性肝炎

E．霍乱

在生产实践中，欲想获得无籽果实，可采用的方法有（）

A.人工诱导多倍体育种

B.人工诱变

C.用适当浓度的生长素刺激未受粉的雌蕊

D.单倍体育种

铝的焊剂为（）。

A.气剂201

B.气剂301

C.气剂401

D.气剂101

Meta-分析的统计分析过程？