如图示直线 l 1 ， l 2 被直线 l 3 所截，且 l 1 / / l 2 ，则 α = ( )
A． 41 ° B． 49 ° C． 51 ° D． 59 °
The wild animals are in danger now． Let's protect ．（ ）
they
them
their
theirs
What nice day! Let's go for a picnic．（ ）
a
an
the
/
Wow! The school uniforms can tell parents_______!
Cool! So the children won't get lost easily．（ ）
where are their children
where their children are
what do their children study
what their children study
Nobody can hear you______ you speak in a louder voice．（ ）
unless
if
when
after
Boys and girls， you should look after________when your parents are not at home．（ ）
himself
herself
yourselves
themselves
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