【单选题】【消耗次数：1】
The estimated quantity of rice per acre [填空]5 tons.
①
is
②
are
③
were
④
be
参考答案：
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相关题目
【单选题】
A: How much is that rice, please? B: [填空].
①
Four Kilo
②
Very much
③
Four are enough
④
Four yuan a kilo
【单选题】
The students can read English at the [填空] of 200 words per minute.
①
speed
②
rate
③
percent
④
time
【单选题】
A: I thought you were working until 6:30. B: [填空], but we finished our meeting at 5:30 and were let go.
①
I tried to
②
I hoped so
③
Id love to
④
I was supposed to
【单选题】
A: Were you at home last night? B: [填空].
①
Certainly
②
Certainly I was
③
Sure I was
④
O.K
【简答题】
Directions: Fill in the blanks with the words given below. Change the form if necessary.[fee; react; expand; besides; quantity; stay; highly; device; customer; commercial]5. Popular television plays are often interrupted by[填空1].
随机题目
【单选题】
判断反应Fe＋2HCl===<img class="kfformula" src="20200708/1594170364547268.png" data-latex="{H}_{2}\uparrow +{FeCl}_{2}" width="107" height="30"/>的反应类型（ ）。
①
复分解反应
②
化合反应
③
氧化还原
④
中和反应
【单选题】
下列离子方程式改写成化学方程式正确的是（ ）。
①
<img class="kfformula" src="20200708/1594171736105845.png" data-latex="{CO}_{2}+{2OH}^{-}==={C{O}_{3}}^{2-}+{H}_{2}O\, \, \, C{O}_{2}+{Ca(OH)}_{2}===CaC{O}_{3}\downarrow +{H}_{2}O" width="523" height="37"/>
②
<img class="kfformula" src="20200708/1594171736247917.png" data-latex="Fe+{Cu}^{2+}==={Fe}^{2+}+Cu\, \, \, Fe+{Cu(OH)}_{2}==={Fe(OH)}_{2}+Cu" width="483" height="37"/>
③
<img class="kfformula" src="20200708/1594170869750528.png" data-latex="{Ag}^{+}+{Cl}^{-}==={AgCl\downarrow \, \, \, AgNO}_{3}+HCl==={AgCl\downarrow +HNO}_{3}" width="463" height="37"/>
④
<img class="kfformula" src="20200708/1594170869665944.png" data-latex="{Mg}^{2+}+{2OH}^{\_ }===Mg{(OH)}_{2}\downarrow \, \, \, {MgSO}_{4}+{Ba(OH)}_{2}==={Mg(OH)}_{2}\downarrow +{BaSO}_{4}\downarrow " width="561" height="37"/>
【单选题】
催化剂在化学反应中占有相当重要的地位，为了壮大催化剂家族，我们应当在元素周期表的哪部分元素中寻找( )。
①
非金属元素中
②
金属元素中
③
超铀元素中
④
过渡元素中