I’msureheisuptothejob__________hewouldgivehismindtoit.A)ifonlyB)incaseC)untilD)unless
I’m sure he is up to the job __________ he would give his mind to it.
A) if only B) in case
C) until D) unless
相关考题：
Tom has many books and _______ likes _______ very much. A.he, itB.he, themC.they, himD.he, they
Ada: How's the young man?Bill:______A、He's twenty.B、He's a doctor.C、He's much better.D、He's Dick.
氦首先发现于日冕。1868年后30年间，太阳是研究氦的物理，化学性质的唯一源泉。(a)观察到太阳可见光谱中有波长为4338A，4540A，4858A，5410A，6558A的吸收(1A=10-10m来分析，这些吸收是由哪一种类氢原子激发造成的?是He，He+还是He2+?(b)以上跃迁都是由ni=4向较高能级(ni)的跃迁。试确定ni值，求里德堡常数.(c)求上述跃迁所沙及的粒子的电离能，用电子伏特为单位。(d)已知I(He+)/I(He)=2.180。这两个电离能的和是表观能A(He2+)，即从He得到He2+的能量。A(He2+)是最小的能量子。试计算能够引起He电离成He2+所需要的最低能量子。在太阳光中，在地球上，有没有这种能量子的有效源泉?
选哪一个He’s watching TV? He’s _______ He’swatchingTV?He’s________tobecleaninghisroom.A)knownB)supposedC)regardedD)considered
B)阅读短文，然后从短文括号中所给词的适当形式填空。Climbingthehighestmountainsintheworldisnotan78(easily)job．Youhavetofightbadweather，illnessandfear．ButJordanRomero，athirteen-year-oldboyfromAmerica，willclimb79(Asia)highestmountain，MountQomolangma．Hewillsetoutthismonth．80(He)parentsandhelperswillclimbwithhim．Heplanstotake81(second)monthsforhisclimb．“I'mready．ButifIdon'treachthetop82(successful)，I'lltrynexttime，”hesaid.Jordanhasalreadyclimbedthehighestmountainsofsixothercontinents(洲)．Ifhe83(get)tothetopthistime，hewillbecometheyoungestpersontoclimbtheworld'shighestmountain．78_________
【单选题】若管路特性方程可写成He’=10.2+0.313V2[m]（式中：V—m3/h）。如选用的泵的“He~V”关系可表达为He=42－0.01V2[m]，若略关小出口阀，使1+∑le从20m变为30m，设λ不变，则新工作点为（）。A．V=9.92m3/h，He=41mB．V=8.14m3/h，He=41mC．V=8.14m3/h，H=41.3mD．V=9.92m3/h，H=41.3m
推测下列气相反应自发的是A．Kr++ He → Kr +He+B．Si+ Cl+→ Si++ClC．Cl-+ I → I-+ClD．Cl-+ F→ F-+Cl